import { createApp } from 'vue'
import App from './App.vue'
import router from './router'
import store from './store'
import ElementPlus from 'element-plus'
import 'element-plus/dist/index.css'
//2.引入element-plus图标库,并起别名为ElementPlusIconsVue
import * as ElementPlusIconsVue from '@element-plus/icons-vue'
//6.1修改elementPlus默认中文
import zhCn from 'element-plus/dist/locale/zh-cn.mjs'
const app = createApp(App)
//10.1 配置全局后端服务器路径
const BASE_URL = 'http://localhost:8080';
//window对象是浏览器内置的全局对象,给它设置属性就是全局属性,可以在任意script标签中使用!
window.BASE_URL = BASE_URL;
//10.2 给app(vue对象)也设置后端服务器的根路径,这样可以在任template标签中使用!
app.config.globalProperties.BASE_URL = BASE_URL;
//3.将所有导入的图标组件变为键值对数组,并依次遍历取出每一个图标组件[key, component]
for (const [key, component] of Object.entries(ElementPlusIconsVue)) {
    // 4.将当前遍历到的图标组件注册为当前vue实例的全局组件
    app.component(key, component)
}
//5.为前vue实例应用element-plus组件库
//6.2 app.use(ElementPlus,{ locale: zhCn })将El本地化为中文

//7.解决ResizeObserver Error
const debounce = (fn, delay) => {
    let timer = null;
    return function () {
        let context = this;
        let args = arguments;
        clearTimeout(timer);
        timer = setTimeout(function () {
            fn.apply(context, args);
        }, delay);
    }
}
const _ResizeObserver = window.ResizeObserver;
window.ResizeObserver = class ResizeObserver extends _ResizeObserver {
    constructor(callback) {
        callback = debounce(callback, 16);
        super(callback);
    }
}

//8.定义全局方法用来获取当前登录的用户数据
// window.getUser = ()=>{
//     return localStorage.user ? JSON.parse(localStorage.user) : null;
// }

//9.配置路由守卫
//to 即将要进入的目标路由
//from 当前的路由
//next 放行函数
// router.beforeEach((to, from, next) => {
//     //获取当前登录的用户数据
//     let user = localStorage.user;
//     //如果当前要进入的路由不是登录页,并且当前用户没有登录,则强制跳转到登录页
//     if(to.path !== '/login' && !user){
//         next({path:'/login'},ElMessage.error('请先登录!'));
//     }else{
//         next();//如果当前访问的是登录页,或用户已登录,直接放行
//     }
// });
app.use(ElementPlus,{ locale: zhCn }).use(store).use(router).mount('#app')

